Domestic animals symbolize fundamental urges and drives in ourselves which we have learnt to meet and direct with reasonable success. They still have to be cared for though or they may rebel against what we ask of them. Buying and selling an animal may indicate the need for the dreamer to be aware of possible tensions with the people close to him.
If the dreamer is selling an animal, this could indicate delays and frustrations; the need for inner calmness to help the dreamer through until he or sees the light at the end of the tunnel.
See Also: PETS.
[1]